1、With four gears frequency conversion adjustment and one button to operate, scientific relax and relieve muscle soreness and fatigue. 2、Through deep and powerful vibration stimulation, relax the tight soft tissue, accelerate the local circulation, quickly decompose the lactic acid produced after exercise, greatly shorten the muscle recovery time. 3、Suitable for both men and women to use, with small size for easy carry, you can put in the pocket, bag to use it anytime and anywhere. 4、With 2500mah long acting lithium battery, only need 3 hours of charging to provide 8 hours of continuous endurance. 5、Low decibel silent motor, give you quiet and comfortable massage experience, scientific massage all parts of the muscle. Item Type: Muscle Massager Material: Aluminium alloy Power Supply: Lithium Battery (Included) Battery Capacity: 2500mAh Applicable Symptoms: Neck and shoulder pain at work: Relieve long term sitting, shoulder and neck pain Fatigue after housework: Relax fatigue after housework Old age waist back ache: Relieve old age waist back ache Warm up before exercise: Warm up and energize your muscles Injury during exercise: Recovery of muscle injury during exercise Fatigue after exercise: Relieve muscle fatigue after exercise Efficacy of 4 Gears: Grade 1 -1800: Wake up muscle Grade 2 -2400: Release fascia Grade 3 -3000: Decompose lactic acid Grade 4 -3600: Deep massage Suitable Parts of Each Massage Head: Flat head: Suitable for all parts of the body to relax and shape the muscles. Cylinder head: Suitable for impacting deep tissues, such as meridians, joints, palms, plantar, etc. Ball head: Suitable for massage arms, waist, buttocks, thighs, calves and other large muscle groups. U-shaped head: Suitable for massage neck, spine, Achilles tendon, etc. Function: 1. Relieve the pain and spasm caused by muscle contusion, sprain and strain. 2. Help the edema circulating in the swollen area. 3. Loose thickened connective tissue and fascia. 4. Reduce the accumulation of lactic acid in muscles. 5. Increase joint flexibility. 6. Eliminate muscle fatigue. Taboo: 1. Aneurysm, bleeding, use blood thinners. 2. Heart disease with a pacemaker or defibrillator, pregnancy, cancer. 3. Within 90 days of internal fixation, the internal fixation distance should not be used within 3 inches. 4. Sensitive parts: head, face, cervical spine and spinal vertebral column. 5. Muscle cover near the bone: humerus. The backs of your feet, the backs of your hands. 1 x Muscle Massage Gun 4 x Massage Heads 1 x USB Cable 1 x English Instruction